ptsname - get name of the slave pseudo-terminal device
char *ptsname(int fildes);
The function ptsname() returns the name of the slave pseudo-terminal
device associated with a master pseudo-terminal device. fildes is a file
descriptor returned from a successful open of the master device.
Upon successful completion, ptsname() returns a pointer to a string
containing the null-terminated path name of the slave device of the form
/dev/tty[qrstuvwxyz]N, where N is an integer between 0 and 99. This
value points to a static data area that is overwritten by each call to
Upon failure completion, ptsname() returns NULL. This could occur if
fildes is an invalid file descriptor, or if the slave device name does
not exist in the file system.
open(2), grantpt(3C), ttyname(3C), unlockpt(3C)
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